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Sandwich material

a sandwich material and material technology, applied in the field of sandwich materials, can solve the problems of high manufacturing cost, difficult welding of sandwich materials, and comparatively lower electrical resistance of sandwich materials

Inactive Publication Date: 2004-07-20
CAMBRIDGE ENTERPRISE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a sandwich material that is particularly useful in vehicle construction. The material is composed of two metal plates separated by a fibrous core. The core is made up of metal fibers that are inclined at an angle to the plates. The material is straightforward and cost-effective to manufacture and has good mechanical properties, including high stiffness and strength. It is also easy to weld and has low electrical resistance. The material can be used in various welded structures or components, such as vehicle parts or components. The technical effects of the invention include improved beam stiffness, interfacial shear strength, and efficient thermal insulation.

Problems solved by technology

A disadvantage of this type of sandwich material is, however, its rather complex, and therefore costly, method of manufacture.
Furthermore, due to its relatively high electrical resistance, this type of sandwich material is not easy to weld.
In addition, the sandwich material has a comparatively lower electrical resistance (because of the good contact between fibres and face-plates), rendering it easily weldable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example

Preparation of Sandwich Material

Two stainless steel plates of length 80 mm, width 20 mm and thickness 200 .mu.m, were coated with a chromium / nickel braze and were then positioned either side of a fibrous stainless steel core of the same length and width and having a thickness of 800 .mu.m, supplied by Bekaert under the product name BEKIPOR.RTM. NPF 90071-000. The resulting sandwich construction was clamped and heated to about 1000.degree. C. in order to bond the metal plates to the core. The areal density of the resulting product was 5.0 kg / m.sup.2, and the core fibre volume fraction was 0.19.

Various physical properties of the resulting sandwich material were subsequently determined, and compared with those of a sandwich material of the type described in WO-A-9801295. This material was prepared by coating one side of a stainless steel plate of length 80 mm, width 20 mm and thickness 200 .mu.m, with a 200 g / m.sup.2 layer of Gurit Essex Betamate (1185) adhesive, and subsequently flock...

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Abstract

A sandwich material comprising two metal plates affixed to and separated by a fibrous core, is characterised in that the core comprises a three-dimensional porous network comprising metal fibres, wherein substantially all of the fibres are inclined at an acute angle to the plates. The sandwich material is lightweight, thin and handles like a monolithic sheet. It displays high beam stiffness and is easy to weld. It as therefore particularly useful in the manufacture of aircraft and vehicle parts.

Description

The present invention relates to a sandwich material, which is particularly useful in vehicle construction.BACKGROUND TO THE INVENTIONIt is well-recognised that sandwich structures, which are composed of stiff outer layers separated by a low density core, offer the potential for very high specific stiffness and other attractive mechanical properties. Such materials are generally rigid and strong, but are of relatively low mass. They are therefore particularly useful as construction materials or packaging materials, for example.WO-A-9801295 discloses a sandwich material comprising metal plates separated by metal fibres arranged perpendicularly to the plates, and which are affixed thereto by an adhesive. The sandwich material is made by coating at least one of the metal plates with an adhesive, and then subjecting short metal fibres to an electrical charge. This causes the fibres to stand upright and propels them into the adhesive on one of the metal plates, where they become anchored...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B32B15/14B32B15/08B32B7/04
CPCB32B7/04B32B15/08B32B15/14Y10T428/1216Y10T428/238Y10T428/24174Y10T428/12444Y10T428/12167Y10T428/24994Y10T428/23914
Inventor CLYNE, TREVOR WILLIAMMARKAKI, ATHINA
Owner CAMBRIDGE ENTERPRISE LTD
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